CN102217399B - Method and apparatus for generating a carrier frequency signal - Google Patents

Method and apparatus for generating a carrier frequency signal Download PDF

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Publication number
CN102217399B
CN102217399B CN200980156326.0A CN200980156326A CN102217399B CN 102217399 B CN102217399 B CN 102217399B CN 200980156326 A CN200980156326 A CN 200980156326A CN 102217399 B CN102217399 B CN 102217399B
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signal
frequency
frequency signal
modulation
equipment
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CN102217399A (en
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克里斯坦·哥如英
安德斯·雅各布
欧拉·派特森
安德斯·艾莫瑞克
李炳鑫
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C3/00—Angle modulation
    • H03C3/02—Details
    • H03C3/09—Modifications of modulator for regulating the mean frequency
    • H03C3/0908—Modifications of modulator for regulating the mean frequency using a phase locked loop
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0014—Carrier regulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/36—Modulator circuits; Transmitter circuits
    • H04L27/361—Modulation using a single or unspecified number of carriers, e.g. with separate stages of phase and amplitude modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0014—Carrier regulation
    • H04L2027/0018—Arrangements at the transmitter end

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transmitters (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Amplitude Modulation (AREA)

Abstract

A method and apparatus for generating a carrier frequency signal is disclosed. The method includes generating a first frequency signal; injecting a modulation signal at a first point of the two-point modulation architecture; 5 generating a second frequency signal from the modulation signal; introducing the second frequency signal by mixing the first frequency signal and the second frequency signal to generate a mixed frequency signal and outputting the carrier frequency signal selected from the mixed frequency signal.

Description

For generating the method and apparatus of CF signal
Technical field
The present invention relates to the communications field, relate in particular to a kind of for generating the method and apparatus of CF signal.
Background technology
Use polar modulation architecture, the phase modulation of carrier wave is by carrying out in the method for modulating phase-locked loop (Phase Locked Loop, PLL) for the frequency synthesizer that generates carrier wave.In order to make the minimum from PLL, its loop filter (loop filter, LPF) bandwidth is conventionally relatively little.Modern wireless communication agreement is (as bandwidth code division multiple access (Wideband Code Division Multiple Access, WCDMA), GSM evolution version enhanced data rates (Enhanced Data Rates for GSM Evolution, EDGE) and other) modulation bandwidth be conventionally greater than this bandwidth.In addition, the required bandwidth of phase modulation is approximately five times of modulation bandwidth.This just produces a problem: when direct modulation PLL, due to its to modulated applications low pass filter, thereby limited modulation bandwidth.
Summary of the invention
problem
Because relatively low loop bandwidth has limited the high modulation bandwidth that can implement, so there will be problem while directly modulating PLL.
Another problem is how to make modulation and counter modulation (counter-modulation, demodulation) mate with 2 modulated structures.
Also having a problem is how to avoid towing (pulling) and the injection locking (injection locking) of oscillator.
Also having a problem is how to realize Fast Channel frequency hopping (channel hopping).
solution
In order to solve one or more problems of pointing out above, from the angle in foregoing invention field, the present invention has lectured:
One embodiment of the present of invention, provide the method for generate CF signal at 2 modulated structures, and it comprises: generate first frequency signal; Locate to inject modulation signal at first at 2 modulated structures; According to modulation signal, generate second frequency signal; By mixing first frequency signal and second frequency signal to generate hybrid frequency signal, introduce described second frequency signal; The CF signal that output is selected from hybrid frequency signal; CF signal is fed back to feedback path.
In further developing, the method also comprises: at the second point place of 2 modulated structures, first modulation signal carried out to counter modulation.
In addition, modulation signal is Digital Modulation word (Digital Modulation Word, DMW).
In addition, modulation signal is modulation voltage (modulation voltage, MV).
In further developing, generate first frequency signal and comprise from digital tuning word (digital tuning word, DTW) generation first frequency signal.
In further developing, generate first frequency signal and comprise according to tuning voltage (TV) generation first frequency signal.
In further developing, by first frequency signal is mixed to generate hybrid frequency signal with second frequency signal, second frequency signal leading is comprised to loop: first frequency signal is mixed with second frequency signal, and output packet is containing first frequency and the difference of second frequency and the hybrid frequency signal of summation; The CF signal that output is selected from hybrid frequency signal comprises: from hybrid frequency signal, select CF signal (wherein, this carrier frequency is difference or the summation of first frequency and second frequency), and export CF signal.
In addition, first frequency signal being mixed to generate hybrid frequency signal with second frequency signal also comprises: the amplitude of modulation hybrid frequency signal.
In addition, generating first frequency signal comprises: generated frequency is different from the first frequency signal of carrier frequency and all harmonic waves thereof.
In addition, from modulation signal, generating second frequency signal comprises: the second frequency signal that is different from carrier frequency and all harmonic waves thereof according to modulation signal generated frequency.
In further developing, the method also comprises by changing second frequency carrys out selective channel.
One embodiment of the present of invention provide for using 2 modulated structures to generate the equipment of CF signal, and it comprises: tuned oscillator (TO), for generating first frequency signal; Modulating oscillator (MO), locates to be injected into modulation signal (MS) first of two dot structures, and also for generating second frequency signal according to modulation signal; Output module, thereby for second frequency signal being incorporated into loop by mixing first frequency signal and second frequency signal after TO to generate hybrid frequency signal, the CF signal that output is selected from hybrid frequency signal, and CF signal is fed back in feedback path.
In further developing, this equipment also comprises: PLL, carries out counter modulation (demodulation) for the second point place at 2 modulated structures to first modulation signal.
In addition, MO can be the first digital controlled oscillator (DCO).
In addition, the input signal of a DCO is Digital Modulation word (DMW).
In addition, MO can be the first voltage controlled oscillator (VCO).
In addition, the input signal of a VCO is modulation voltage (MV).
In addition, MO can be mixer oscillator.
In addition, the input signal of mixer oscillator is MV and DMW.
In addition, TO can be the second DCO.
In addition, the input signal of the 2nd DCO is digital tuning word (digital tuning word, DTW).
In addition, TO can be the second VCO.
In addition, the input signal of the 2nd VCO is tuning voltage (TV).
In addition, output module also comprises: blender, and for first frequency signal is mixed with second frequency signal, and output packet is containing first frequency and the difference of second frequency and the hybrid frequency signal of summation; And output filter, for selecting CF signal (wherein, carrier frequency is difference or the summation of first frequency and second frequency) according to hybrid frequency signal, output CF signal, and CF signal is fed back to feedback path.
In addition, output module is for modulating the amplitude of hybrid frequency signal.
In addition, TO is different from the first frequency signal of carrier frequency and all harmonic waves thereof for generated frequency.
MO is also different from the second frequency signal of carrier frequency and all harmonic waves thereof for generated frequency.
In addition, this MO also, for by changing second frequency, carries out channel and selects.
For further exploitation, this equipment will be used in base station.
invention advantage
The advantage of the method and apparatus in the embodiment of the present invention is: owing to using 2 modulated structures, can in high modulation bandwidth, to PLL, modulate.
According to one in the embodiment of the present invention, another advantage of the embodiment of the present invention is: these 2 modulated structures, when implementing, can increase matching degree between modulation and counter modulation greatly, thereby has increased the accuracy of modulation.
According to another advantage of an embodiment, be: can use equality conversion in first frequency, compensate the skew in second frequency.
According to another advantage of an embodiment, be: can reduce or avoid towing and injection locking to oscillator.
According to another advantage of an embodiment, be: can enable channel hopping faster.
Accompanying drawing explanation
Below with reference to accompanying drawing, describe in detail according to method and apparatus of the present invention, wherein:
Fig. 1 is the structure chart of one embodiment of the present of invention;
Fig. 2 is the structure chart of equipment according to an embodiment of the invention;
Fig. 3 is the structure chart of equipment according to an embodiment of the invention;
Fig. 4 is the structure chart of one embodiment of the present of invention;
Fig. 5 is the structure chart of equipment according to an embodiment of the invention;
Fig. 6 is the structure chart of one embodiment of the present of invention;
Fig. 7 is the structure chart of equipment according to an embodiment of the invention; And
Fig. 8 is the structure chart of one embodiment of the present of invention.
Embodiment
For fear of the low problem of bandwidth, can also use 2 modulated structures, wherein, modulation signal inserts on a point, to modulate output loop (PLL), and is oppositely inserted in circuit feedback path, so that loop can not be modulated.
Below with reference to Fig. 1, described one embodiment of the present of invention, it has shown a kind of method that generates CF signal in 2 modulated structures.
Step 101: generate first frequency signal.
First frequency signal can be expressed as f 1.
This embodiment can comprise: according to digital tuning word (DTW), generate first frequency signal, or generate first frequency signal (what specifically depend on use is digital controlled oscillator (DCO) or voltage controlled oscillator (VCO)) according to tuning voltage (TV).DTW or TV are the output of PLL.
Another problem running into is, oscillator towing and injection locking may cause output generation spuious (spur) problem.Therefore, this embodiment especially comprises, generated frequency is different from the first frequency signal of carrier frequency fc and all harmonic waves thereof.Due to f 1different from carrier frequency fc or its harmonic wave, so the spuious problem that can reduce or avoid towing and injection locking to cause.
Step 102: modulation signal is injected at first some place at 2 modulated structures.
Modulation signal (MS) can be the combination of a Digital Modulation word (DMW) or modulation voltage (MV) or DMW and MV, and this depends on whether used DCO or VCO or mixer oscillator.
A problem using 2 modulated structures to run into, that is exactly the problem that modulation and counter modulation are matched, and the generation of this problem is because counter modulation signal is digital signal conventionally in essence, and modulation signal is generally analog signal.If modulation signal is the digital signal as DMW, because modulation signal and counter modulation signal are digital signal in essence, so can greatly increase the matching degree between modulation and counter modulation, and due to the gain under its numerical characteristic and good control, it is stable that process and temperature can keep.Compared with prior art, the increase of matching degree can improve modulation accuracy.If digital control with process mixer oscillator (course digital control) and simulative optimization control (analogue fine control) are combined with, can obtain a lower matching degree that still still can satisfy the demands.The use of mixer oscillator can improve resolving power and the flexibility of system.This function can be implemented in all embodiment of the present invention, and can realize identical advantage.
Step 103: generate second frequency signal according to modulation signal.
Second frequency signal can be expressed as f 2.
The present embodiment especially comprises and generates second frequency signal, and the frequency of described second frequency signal is different from all harmonic waves of carrier frequency fc from modulation signal and carrier frequency fc.Due to f 2different from carrier frequency fc or its harmonic wave, so the problem that can reduce or avoid towing and injection locking to bring.
The control of first frequency and second frequency can be implemented in all embodiment of the present invention, can realize similar effect simultaneously.
Step 104: by first frequency signal is mixed to generate hybrid frequency signal with second frequency signal, by second frequency signal leading in loop.
This embodiment can comprise especially first frequency signal is mixed with second frequency signal, and output packet is containing first frequency f 1with second frequency f 2difference and the hybrid frequency signal of summation.
This embodiment also further comprises the amplitude of modulation hybrid frequency signal to introduce Modulation and Amplitude Modulation in polar transmitter structure.
Step 105: the CF signal that output is selected from hybrid frequency signal.
Step 105 can realize by filtering or other suitable methods.
This embodiment can comprise especially from hybrid frequency signal and selects CF signal, and exports CF signal, and wherein, the carrier frequency of described CF signal can be difference or the summation of first frequency and second frequency.
Can select first frequency f 1with second frequency f 2between difference or summation in one as required carrier frequency fc, and remaining one can operate to remove by suitable selection.
Selected frequency difference is as carrier frequency fc=f 1-f 2, can in the situation that not using frequency divider, use the oscillator frequency higher than carrier frequency frequency.The benefit of bringing is exactly, can power-dissipation-reduced, because frequency divider can bring obvious power consumption.
Step 106: CF signal is fed back to PLL feedback path.
By this mode, fc, f 2and f 1in any shake with skew all by by the f that originates from PLL 1in the compensating of equivalence transformation (as long as f 1scope enough large).
Method related in the present embodiment is further comprising the steps of.
Step 107: the second point place at 2 modulated structures carries out counter modulation to first modulation signal.
Second point can be arranged in PLL.Because compared with modulation bandwidth, the bandwidth of PLL is lower, has therefore reduced the bandwidth of counter modulation, thereby can simplify its insertion.
By introducing counter modulation signal (CMS), from feedback signal, delete first modulation, so that it there will not be in PLL.Feedback path, after output, and has built the second point in 2 modulated structures.Because PLL can not see this modulation, so PLL is not affected by the band-limited of PLL can.Thereby this mode makes can be in the low wide-band modulation of carrying out carrier frequency in situation that obtains of loop bandwidth.
In the prior art, channel selection is to realize by the frequency dividing ratio N of change PLL.This change decays by the loop transfer function (loop transfer function) of PLL.In this embodiment, because carrier frequency fc is by f 1and f 2common decision, so can carry out selective channel by changing second frequency f2.This change can instead be inserted into the second point place of 2 modulated structures.PLL can be arranged in base station.PLL should be able to enable than the channel hopping more fast of the solution in prior art, critical function when this is design base station transceiver.
PLL can be used in any reflector of frequency change faster and/or bandwidth frequency modulation.
According to embodiments of the invention, can find out, due to 2 modulated structures, can modulated carriers signal, modulation can not seen in this loop, therefore PLL can modulate in the situation that not considering low loop bandwidth under high modulation bandwidth.If modulation signal is digital,, when using 2 modulated structures, modulation signal can be mated with counter modulation signal.Compared with prior art, the coupling of this increase can increase the accuracy of modulation.Fc, f 2and f 1in any shake or skew will pass through f 1in equivalent variations compensate.Use difference frequency fc=f1-f2 can allow to enable high oscillator frequency and needn't use frequency divider, therefore can reduce power consumption simultaneously.This towing and injection locking can reduce or avoid by controlling first frequency f1 or second frequency f2.Embodiments of the invention can also be enabled channel hopping faster by change second frequency f2.If PLL, for base station, can improve the performance of base station.
Below with reference to Fig. 2, describe one embodiment of the present of invention, it has shown the equipment 20 for generate CF signal at 2 modulated structures.Equipment 20 can be frequency synthesizer.Equipment 20 comprises modulating oscillator (MO) 201, tuned oscillator (TO) 202 and output module 203.
TO 202 is f for generating specified output frequency 1first frequency signal.The input signal of TO 202 can be harmonic ringing.
MO 201 is for locating to be injected into modulation signal first of 2 modulated structures, and is f for generating rated output power according to modulation signal 2second frequency signal.
Output module 203 is for generating hybrid frequency signal by first frequency signal is mixed with second frequency signal, after TO 202 by second frequency signal leading in loop, and the CF signal that output is selected from hybrid frequency signal, and CF signal is fed back to feedback path.
Equipment 20 also comprises PLL 204, and described PLL204 is for first modulation signal of second point place counter modulation at 2 modulated structures.
Especially, PLL 204 will, by counter modulation signal (CMS) method, delete first modulation of carrier frequency.This will build the second point of 2 modulated structures.Counter modulation signal can be applied to the input of PLL 204.PLL 204 carries out frequency division by frequency dividing ratio N to carrier frequency, and itself and reference frequency are compared, and then by the error signal producing, regulates TO 202.PLL 204 can adopt analog PLL (APLL) or digital PLL (DPLL).CMS can be used in the feedback path of PLL 204.CMS can be used as skew and is inserted in frequency dividing ratio N.Because the bandwidth of PLL 204 is lower than modulation bandwidth, thus the bandwidth of counter modulation can be reduced, thus can simplify its insertion.
MO 201 can be the first numerical control vibrator (DCO), or the mixing of the first voltage controlled oscillator (VCO) or a DCO and a VCO.If MO 201 is DCO, its input signal can be Digital Modulation word (DMW).If MO 201 is VCO, its input signal can be modulation voltage (MV).If MO is mixer oscillator, its input signal is DMW and MV.MO input signal can be expressed as modulation signal.
The problem existing in 2 modulated structures, because counter modulation signal is digital signal conventionally in essence, and modulation signal is generally analog signal, therefore between modulation and counter modulation, has the problem of coupling.If MO 201 is DCO with numeral input, because modulation signal and counter modulation signal are all digital signals in essence, matching degree between modulation and counter modulation can be greatly improved, and due to its numerical characteristic and the good gain of controlling, it is stable that process and temperature can keep.Compared with prior art, the raising of this matching degree can improve the accuracy of modulation.According to modulus control range, than (Ration of analogue to digital control range), mixer oscillator also can bring identical effect to a certain extent.The use of mixer oscillator can increase resolving power (Resolution) and the flexibility of system.
TO 202 can be the 2nd DCO or the 2nd VCO.If TO 202 is the 2nd DCO, its input signal can be Digital Modulation word (DTW).If TO 202 is the 2nd VCO, its input signal can be tuning voltage (TV).If TO 202 is the 2nd DCO, it will be controlled by DPLL.If TO 202 is the 2nd VCO, it will be controlled by APLL.VCO can also have digital control input, but this input can be used for process control, is not regarded as tuning input.
Between the nonmobile phase of equipment 20, MO 201 can be used suitable tolerance to align with TO 202, so that two oscillators all can be worked under desirable condition of work.
DCO (DCO or the 2nd DCO) output frequency is determined by the value of numerically controlled LC resonant circuit (LC-tank) (there is no explanation in Fig. 2).This resonant circuit is comprised of variable part (variable part) and standing part.The ratio of variable part and standing part will be determined the gain of DCO.This ratio can be controlled or be compensated by measurement by coupling.Can the resolving power of variable part is enough high.
Output module 203 also comprises blender 2031 and output filter 2032.
Blender 2031 is for first frequency signal is mixed with second frequency signal, and output packet is containing first frequency f 1with second frequency f 2difference and the hybrid frequency signal of summation.
Output filter 2032, for select CF signal and output CF signal from hybrid frequency signal, and feeds back to CF signal in feedback path, and wherein, carrier frequency fc is first frequency f 1with second frequency f 2difference or summation.
Can be by first frequency f 1with second frequency f 2difference or summation in any select as required carrier frequency fc, by the suitable selection by output filter 2032, delete for remaining one.CF signal is fed back to PLL 204.Adopt in this way fc, f 1and f 2in any shake or skew can be by the f in feedback signal 1equivalent variations compensate (as long as f 1scope enough large).
Use difference frequency fc=f 1-f 2can enable high oscillator frequency time avoid using frequency divider, therefore can reduce current power consumption.If fc and frequency summation f 1+ f 2between difference larger, relatively simple RC filter can be used in output filter 2032.If use LC blender, LC resonant circuit can build an electrode of this filter.
Output module 203 is also for modulating the amplitude of hybrid frequency signal.As required, blender 2031 also can be used for the amplitude of the hybrid frequency signal of modulation use signal A (t).Here must think much and examine, to guarantee that PLL 204 can process amplitude-modulated signal.
Equipment 20 can be used in transceiver.Another problem running in transceiver is that MO 201 or the towing of TO 202 and the impact of injection locking can cause occurring spuious problem in reflector output.
Therefore, TO 202 is also different from the first frequency signal of carrier frequency fc and all harmonic waves thereof for generated frequency.Because first frequency is different with its harmonic wave from carrier frequency fc, so can reduce or avoid to go wrong in towing and injection locking.
Modulation CO 202 also can be configured to the second frequency signal that generated frequency is different from carrier frequency fc and all harmonic waves thereof.Because second frequency is different from carrier frequency fc and harmonic wave thereof, so can reduce or avoid MO201 to go wrong in towing and injection locking.
In the prior art, the selection of the channel of equipment 20 is to realize by the frequency dividing ratio N of change PLL 204.This change decays by the loop transfer function of PLL 204.Because carrier frequency fc is by f 1and f 2common definite, MO 201 is also for passing through change second frequency f 2carrying out channel selects.This change can be carried out anti-plug at the second point place of 2 modulated structures and enter.Equipment 20 is applied in base station, enables than prior art channel frequency modulation faster a critical function need to considering when this is design base station transceiver.
Equipment 20 can be used in any reflector, wherein needs frequency change faster and/or bandwidth frequency modulation.
According to embodiments of the invention, we can find out, due to 2 modulated structures, can directly modulate the output of TO 202, and modulation can not seen in loop, although therefore PLL loop bandwidth is lower, can under high modulation bandwidth, modulate yet.If the input signal characteristics of MO 201 is digital,, when using 2 modulated structures, modulation signal can be mated with counter modulation signal.Compared with prior art, the increase of this matching degree can increase the accuracy of modulation.Fc, f 2and f 1in any shake or skew can pass through f 1equivalent variations compensate.Use difference frequency fc=f 1-f 2can enable high oscillation frequency and needn't use frequency divider, therefore can reduce power consumption simultaneously.By controlling the output frequency of MO 201 or TO 202, can reduce or avoid towing and injection locking.If can also enabling channel hopping equipment 20 faster by change second frequency f2, embodiments of the invention for base station, can improve the performance of base station.
For a better understanding of the present invention, some detailed embodiment are also provided.
Below with reference to Fig. 3, a specific embodiment of the present invention is described.Suppose that MO201 is DCO301, TO 202 is VCO 302.The input signal of DCO 301 is DMW.In other words, modulation signal is DMW.The input signal of VCO is TV.In other words, harmonic ringing TS is TV.PLL 204 is analog PLL (APLL) 304, it comprises multi-modulus frequency divider (Multi-Modulus Divider, MMD) 3041, Sigma-Delta modulator (∑ Δ) 3042, phase frequency detector (Phase-Frequency Detector, PFD) 3043, charge pump (Charge-Pump, CP) 3044 and low pass filter (LoW Pass Filter, LPF) 3045.As shown in Figure 4, the method for this specific embodiment comprises following.
Step 401:VCO 302 generates first frequency signal according to TV.
This embodiment can comprise the VCO 302 that generates first frequency signal especially, and the frequency of first frequency signal is different from all harmonic waves of carrier frequency fc and carrier frequency fc.Due to f 1different from fc or its harmonic wave, so can reduce or avoid towing and the injection locking problem of VCO 302.
Step 402: DMW is injected at first some place at 2 modulated structures.
In other words, DMW is injected in DCO 301.
Step 403:DCO 301 generates second frequency signal according to DMW.
This embodiment can comprise the DCO 301 that generates second frequency signal especially, and the frequency of second frequency signal is different from all harmonic waves of carrier frequency fc from DMW and carrier frequency fc.Due to f 2different from fc or its harmonic wave, so can reduce or avoid towing and the injection locking problem of DCO 301.
Step 404: output module 203 is by first frequency signal is mixed to generation hybrid frequency signal with second frequency signal, with by second frequency signal leading in loop.
This embodiment can comprise the blender 2031 that first frequency signal is mixed with second frequency signal especially, and output packet is containing first frequency f 1with second frequency f 2difference and the hybrid frequency signal of summation.
This embodiment also comprises the output module 203 of the amplitude of modulation hybrid frequency signal.As required, blender 2031 also can be used for the amplitude of the output of modulation use signal A (t).In order to ensure MMD3041, now can process amplitude-modulated signal, some problems require careful consideration.
Step 405: output module 203 is exported the CF signal of selecting from hybrid frequency signal.
This embodiment can comprise the output filter 2032 of selecting CF signal and export CF signal from hybrid frequency signal especially, and wherein, this carrier frequency is first frequency f 1with second frequency f 2difference.
First frequency f 1with second frequency f 2difference be selected as required carrier frequency fc, frequency summation f1+f2 deletes by output filter 2032.
Use difference frequency fc=f 1-f 2can when enabling high oscillator frequency, needn't use frequency divider, therefore can reduce current power consumption.
Step 406: CF signal feeds back in MMD 3041 by output module 203.
MMD 3041 can carry out frequency division to carrier frequency by integer frequency ratio N.In this embodiment, comprising frequency dividing ratio N is controlled by ∑ Delta modulator 3042.Adopt the method, fc, f 2and f 1in any shake that does not belong to a modulation part or skew by by the f that comes from feedback signal 1in equivalent variations compensate (as long as f1 scope enough large).
Step 407: the ∑ Delta modulator 3042 at the second point place that first modulation signal can be by being positioned at 2 modulated structures carries out counter modulation.
The modulation in CF signal is deleted in input by modulation ∑ Delta modulator 3042.This counter modulation has built the second point in 2 modulated structures.The input signal of ∑ Delta modulator 3042 is digital signals, and the gain of counter modulation is accurate.The DMW that modulation is incorporated in DCO 301 is also digital, and the gain of DCO 301 also can obtain good control.This can greatly reduce the mismatch problem between modulation and the counter modulation existing in prior art.
Because compared with modulation bandwidth, the bandwidth of APLL 304 is lower, therefore can reduce the counter modulation bandwidth of ∑ Delta modulator 3042, thereby can simplify its insertion.
The method of this embodiment of the present invention, also can comprise MO 201 (DCO 301) by changing second frequency f 2carry out selective channel.This change can be carried out anti-plug at the second point place of 2 modulated structures and enter.Equipment 20 can be arranged in base station, thereby can enable channel hopping faster, and this is an important property in base station transmitter.
Equipment 20 can be used in any reflector, wherein needs frequency change faster and/or bandwidth frequency modulation.
Below with reference to Fig. 5, a specific embodiment of the present invention is described.In this specific embodiment, the structure of equipment 20 is similar to Fig. 3 (except hypothesis MO 201 is as a VCO 501).Suppose that tuned oscillator (TO) 202 is as VCO 302.For the sake of clarity, VCO 302 is designated as the 2nd VCO302.The input signal of the one VCO 501 is MV.In other words, modulation signal is MV.The input signal of the 2nd VCO302 is TV.In other words, harmonic ringing is TV.As shown in Figure 6, the method for this specific embodiment comprises following steps.
Step 601: the 2nd VCO 302 generates first frequency signal according to TV.
This embodiment can comprise the 2nd VCO 302 that generates first frequency signal especially, and the frequency of first frequency signal is different from all harmonic waves of carrier frequency fc and carrier frequency fc.Due to f 1different from fc or its harmonic wave, so can reduce or avoid towing and the injection locking problem of VCO 302.
Step 602: MV is injected at first some place at 2 modulated structures.
In other words, DMW is injected in a DCO 301.
Step 603 a: VCO501 generates second frequency signal according to MV.
This embodiment can comprise a DCO 301 who generates second frequency signal especially, and the frequency of described second frequency signal is different from carrier frequency fc and all harmonic waves thereof from DMW.Due to f 2different from fc or its harmonic wave, so can reduce or avoid towing and the injection locking problem of MO 201.
Step 604: output module 203 is by first frequency signal is mixed to generation hybrid frequency signal with second frequency signal, with by second frequency signal leading in loop.
This embodiment can comprise blender 2031 output packets that first frequency signal is mixed with second frequency signal especially containing first frequency f1 and the difference of second frequency f2 and the hybrid frequency signal of summation.
This embodiment also comprises output module 203 and modulates the amplitude of hybrid frequency signal.As required, blender 2031 also can be used for using signal A (t) to modulate the amplitude of output.In order to ensure MMD3041, now can process Modulation and Amplitude Modulation input signal, should be noted that some problems.
Step 605: output module 203 is exported the CF signal of selecting from hybrid frequency signal.
This embodiment can comprise especially output filter 2032 and select CF signal from hybrid frequency signal, and exports CF signal, and wherein, this carrier frequency is first frequency f 1with second frequency f 2difference.
First frequency f 1with second frequency f 2difference be selected as required carrier frequency fc, frequency summation f 1+ f 2by filter 2032, carrying out suitable selection deletes.
Difference frequency fc=f 1-f 2use make needn't use frequency divider when enabling high oscillator frequency, therefore can reduce current power consumption.
Step 606: CF signal is output module 203 and feeds back in MMD 3041.
MMD 3041 can carry out frequency division to carrier frequency by integer frequency ratio N.This embodiment comprises frequency dividing ratio N and is controlled by ∑ Delta modulator 3042.Adopt the method, fc, f 2and f 1in any shake that does not belong to a modulation part or skew by by the f that comes from feedback signal 1large equivalence transformation compensate, as long as f 1scope enough.
Step 607: the ∑ Delta modulator 3042 at the second point place that first modulation signal can be by being positioned at 2 modulated structures carries out counter modulation.
Modulation in CF signal will be deleted by the input of modulation ∑ Delta modulator 3042.This counter modulation has built the second point in 2 modulated structures.
If compared with modulation bandwidth, the bandwidth of APLL 304 is lower, can reduce the bandwidth of the counter modulation of ∑ Delta modulator 3042, thereby can simplify its insertion.
Method according to this embodiment of the invention also can comprise MO 201 (VCO 501) selects the channel of base station by changing second frequency f2.This change can be carried out anti-plug at the second point place of 2 modulated structures and enter.Equipment 20 can be arranged in base station, thereby can enable channel hopping faster, and this is an important property in base station transmitter.
Equipment 20 can be used in any reflector, wherein needs frequency change faster and/or bandwidth frequency modulation, or wherein must have the good immunity to interference to towing and injection locking.
Below with reference to Fig. 7, a specific embodiment of the present invention is described.In this specific embodiment, except hypothesis MO 202 is as the 2nd DCO 701, suppose that PLL 204 is as DPLL 702, the framework of equipment 20 is similar to the embodiment in Fig. 3.For the sake of clarity, DCO 301 is called a DCO301.The input signal of the one DCO 301 is DMW.In other words, modulation signal is DMW.The input signal of the 2nd DCO 701 is DTW.In other words, harmonic ringing is DTW.As shown in Figure 8, the method for this specific embodiment comprises following steps.
Step 801: the 2nd DCO 701 generates first frequency signal according to DTW.
This embodiment can comprise especially the 2nd DCO 701 and generate first frequency signal, and its frequency is different from carrier frequency fc and all harmonic waves thereof.Due to f 1different from fc or its harmonic wave, so can reduce or avoid towing and the injection locking problem of TO202.
Step 802: DMW is injected at first some place at 2 modulated structures.
In other words, MV is injected in a DCO 301.
Step 803 a: DCO 301 generates second frequency signal according to DMW.
This embodiment can comprise especially a DCO 301 and generate second frequency signal, and the frequency of second frequency signal is different from carrier frequency fc and all harmonic waves thereof from DMW.Due to f 2different from fc or its harmonic wave, so can reduce or avoid towing and the injection locking problem of MO 201.
Step 804: output module 203 is by mixing to generate hybrid frequency signal by first frequency signal with second frequency signal, by second frequency signal leading in loop.
This embodiment can be particularly including the blender 2031 that first frequency signal is mixed with second frequency signal, and output packet is containing first frequency f 1with second frequency f 2difference and the hybrid frequency signal of summation.
This embodiment also comprises output module 203 and modulates the amplitude of hybrid frequency signal.As required, blender 2031 also can be used for using signal A (t) to modulate the amplitude of output.In order to ensure the feedback path in digital PLL (DPLL) 702, now can process Modulation and Amplitude Modulation input signal, should be noted that some problems.
Step 805: output module 203 is exported the CF signal of selecting from hybrid frequency signal.
This embodiment can comprise especially output filter 2032 and from hybrid frequency signal, selects CF signal and export CF signal, and wherein, this carrier frequency is first frequency f 1with second frequency f 2difference.
First frequency f 1with second frequency f 2difference be selected as required carrier frequency fc, frequency summation f 1+ f 2suitable selection by output filter 2032 is deleted.
Use difference frequency fc=f 1-f 2can enable high oscillator frequency, needn't use frequency divider, therefore can reduce current power consumption simultaneously.
Step 806: CF signal is output module 203 and feeds back in DPLL 702.
DPLL 702 regulates DTW signal to obtain the specific ratios R between carrier frequency fc and reference frequency.The particular implementation of DPLL 704 is not presented in Fig. 7.Adopt the method, fc,, f 2with f 1in any shake that does not belong to a modulation part or skew by because the constructed feedback of DPLL 704, by f 1in carry out equivalence conversion and compensate, as long as the scope of f1 is enough large.
Step 807: the DPLL 702 at the second point place that first modulation signal can be by being positioned at 2 modulated structures carries out counter modulation.
Modulation in CF signal will be deleted by the ratio R of modulation DPLL 704.This counter modulation has built the second point in 2 modulated structures.The characteristic of DPLL 704 is digital, and ratio R is accurate.The DMW that modulation is incorporated in DCO 301 is also digital, and the gain of a DCO 301 also can obtain good control.This can greatly reduce the mismatch problem between modulation and the counter modulation existing in prior art.
Because compared with modulation bandwidth, the bandwidth of DPLL 704 is lower, therefore can reduce the counter modulation bandwidth of DPLL 704, thereby can simplify its insertion.
Method according to this embodiment of the invention, also can comprise MO 201 (DCO 301) (modulation CO 202), by changing second frequency f2, carrys out selective channel.This change can be carried out anti-plug at the second point place of 2 modulated structures and enter.Equipment 20 can be arranged in base station, thereby can enable channel hopping faster, and this is an important property in base station transmitter.
Equipment 20 can be used in any reflector, wherein needs frequency change faster and/or bandwidth frequency modulation.
If the function of these embodiment and above-described this type of embodiment does not repel each other, can be combined with.
Should be appreciated that, the present invention is not limited in the embodiment described in foregoing and literary composition, and can within the scope of innovation concept of the present invention, modify, as shown in the rights statement of enclosing.

Claims (26)

1. for generate a method for CF signal at 2 modulated structures, it comprises:
Generate first frequency signal;
Locate to inject modulation signal at first at 2 modulated structures;
According to described modulation signal, generate second frequency signal;
By described first frequency signal is mixed with described second frequency signal, generate hybrid frequency signal, introduce described second frequency signal;
The CF signal that output is selected from described hybrid frequency signal; And
Described CF signal is fed back to feedback path;
At the second point place of 2 modulated structures, first modulation signal carried out to counter modulation.
2. the method for claim 1, wherein described modulation signal is Digital Modulation word DMW.
3. the method for claim 1, wherein described modulation signal is modulation voltage MV.
4. the method for claim 1, wherein generating first frequency signal comprises according to digital tuning word DTW generation first frequency signal.
5. the method for claim 1, wherein generating first frequency signal comprises from tuning voltage TV and generates described first frequency signal.
6. the method for claim 1, wherein by described first frequency signal is mixed with described second frequency signal, generate hybrid frequency signal, introduce described second frequency signal and comprise:
Described first frequency signal is mixed with described second frequency signal, and output comprises the hybrid frequency signal of difference and the summation of first frequency and second frequency; And
Wherein, the CF signal that output is selected from described hybrid frequency signal comprises:
From hybrid frequency signal, select described CF signal, and export CF signal, wherein, described carrier frequency is difference or the summation of first frequency and second frequency.
7. the method for claim 1, wherein described first frequency signal is mixed to generate hybrid frequency signal with described second frequency signal, also comprise the amplitude of modulating described hybrid frequency signal.
8. the method for claim 1, wherein generate first frequency signal and comprise the described first frequency signal of generation, wherein, the frequency of described first frequency signal is different from all harmonic waves of carrier frequency and carrier frequency.
9. the method for claim 1, wherein from modulation signal, generating second frequency signal comprises: according to described modulation signal, generate second frequency signal, wherein, the frequency of described second frequency signal is different from all harmonic waves of carrier frequency and carrier frequency.
10. the method for claim 1, wherein the method also comprises by changing second frequency selective channel.
11. 1 kinds for using 2 modulated structures to generate the equipment of CF signal, and it comprises:
A tuned oscillator TO, for generating first frequency signal;
A modulating oscillator MO, locates to be injected into a modulation signal MS first of 2 modulated structures, and described MO is for generating second frequency signal according to modulation signal; And
An output module, for generating hybrid frequency signal by described first frequency signal is mixed with described second frequency signal, come after TO by described second frequency signal leading in loop, the CF signal that output is selected from hybrid frequency signal, and CF signal is fed back to feedback path;
A PLL, for the second point place at 2 modulated structures, carries out counter modulation to described first modulation signal.
12. equipment as claimed in claim 11, wherein, described MO is the first digital controlled oscillator DCO.
13. equipment as claimed in claim 12, wherein, the input signal of a described DCO is Digital Modulation word DMW.
14. equipment as claimed in claim 11, wherein, described MO is the first voltage controlled oscillator VCO.
15. equipment as claimed in claim 14, wherein, the input signal of a described VCO is modulation voltage MV.
16. equipment as claimed in claim 11, wherein, described MO is mixer oscillator.
17. equipment as claimed in claim 16, wherein, the input signal of described mixer oscillator is MV and DMW.
18. equipment as claimed in claim 11, wherein, described TO is the 2nd DCO.
19. equipment as claimed in claim 18, wherein, the input signal of described the 2nd DCO is digital tuning word DTW.
20. equipment as claimed in claim 11, wherein, described TO is the 2nd VCO.
21. equipment as claimed in claim 20, wherein, the input signal of described the 2nd VCO is tuning voltage TV.
22. equipment as claimed in claim 11, wherein, described output module comprises:
Blender, for described first frequency signal is mixed with described second frequency signal, and output packet is containing first frequency and the difference of second frequency and the hybrid frequency signal of summation; And
Output filter, for selecting CF signal from hybrid frequency signal, wherein, carrier frequency is difference or the summation of first frequency and second frequency, output CF signal, and CF signal is fed back in feedback path.
23. equipment as claimed in claim 11, wherein, described output module is also for modulating the amplitude of hybrid frequency signal.
24. equipment as claimed in claim 11, wherein,
TO is used for generating first frequency signal, and the frequency of described first frequency signal is different from all harmonic waves of described carrier frequency and described carrier frequency.
25. equipment as claimed in claim 11, wherein,
Described MO is also for generating second frequency signal, and the frequency of described second frequency signal is different from all harmonic waves of described carrier frequency and described carrier frequency.
26. equipment as claimed in claim 11, wherein, described MO is for carrying out channel selection by changing second frequency.
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